Like humans, zebra finches form monogamous partnerships in order to rear children. And, very much like us, these birds are also known to indulge in "extramarital" sex, even when these affairs serve no obvious evolutionary purpose.

The venom of the Brazilian wandering spider has some seriously nasty effects, causing victims to lose control of their muscles, slowly lose the ability to breathe...and, if the victim is male, get an erection that lasts longer than four hours.

Never mind the potential male pill: Sex science has invented a spray that'll cure the problem of premature ejaculation, as long as you don't mind burning sensations or rashes. And wash it off quickly afterwards.